Machine for turning insulator-pins



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J. J, BALDWIN. MACHINE FOR TURNING INSULATOR PINS. No. 298,543

Patented May 13,1884.

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(No Model.) 2 Sheets-Sheet 2.

J. J. BALDWIN.

MACHINE FOB. TURNING INSULATOR PINS. No. 298,543. Patented May 13, 1884'.

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JOSEPH J. BALD\VIN, OF BALTIMORE, MARYLAND.

MACHINE FOR TURNING lNSULATOR-PINS.

SPECIFICATION forming part of Letters Patent No. 298,543, dated May 13, 1884.

Application filed April 9, 1884. (No model.)

To alt whom it may concern.-

Be it known that I, J osnrrr J. BALDWIN, a citizen of the United States, residing at Baltimore, State of Maryland, have invented certain new and useful Improvements in Machines for Turning Insulator-Pins, of which the following is a specification.

My invention relates to a machine for turning pins, particularly insulator-pins for electric wires.

The construction of the improved machine will first be described, and then the parts and combinations comprising the invention will be designated in the claims.

In the drawings hereto annexed, Figure l is a vertical longitudinal section of the machine, except the bed, which, instead of being sectioned, has the front side partly broken away. Fig. 2 is a view of top of the machine. Fig. 3 is a side elevation of the machine, in which, however, the rod J is not shown. Fig. 4 is a horizontal longitudinal section of the machine, showing parts not seen in Fig. 2. Fig. 5 is an end view of the cutter-head.

The letter A designates the bed of the machine; B, a stationary or fixed frame resting on the bed and supporting a hollow mandrel, a, and cutter-head b,- and B, areciprocating frame which moves alternately away from and then back toward the fixed frame, and carries a hollow mandrel, a, and cutter-head b. The two hollow mandrels and cutter-heads, when in operation, are to turn in opposite directions. The hollow mandrel a has three pulleys, oneof which, 0, is tight, and the others, a, are loose, and two belts pass from these pulleys over the drum 6' on the counter-shaft c. The belt d,which in operation is the drivebelt, is crossed, and the belt d, which in operation is on a loose pulley, is straight. The hollow mandrel a has a fixed pulley, f, which. is driven by a straight belt, f, which passes over adrum, 6", on the counter-shaft above. The hollow mandrel a also has a screw-worm, g, on it, which engages with a screw-wheel, 71, on a shaft, h, which also carries a pinion, This pinion engages with a cogged crankwheel, 2', and a pitman-rod, 7c, has one end on the crank-wrist Z on the reciprocating frame, and the other on a wooden pin, m, made fast to the fixed frame 13. The crank-wrist Z is the machine may be adjusted forturning longer or shorter pins.

The object of having the pin m made of wood is to provide for stopping the movement of the frame B in case of accident occurringin any way and inability to shift the belts. Under such circumstances the unusual strain which would be caused on the wood pin on would break it. These partsnamely, the screw-worm, its gcaring,cranl\:-wheel, and pitman having one end fixed at the pin-c0mprise the mechanism which gives movement to the frame 13. This frame slides on two bars, a, on the top of the bed. The hollow mandrels each carry a hollow cutter-head, b b, provided with a knife. A cutter-head of any size or shape may be used, and thereby pins of various forms may be produced.

Now, one of the features of my invention are the movable center grips, G G, which 00- cupy and move endwise through the hollow mandrels. For the greater part of their length each center grip fits neatly or fills the bore of the hollow mandrel, but at and for a short distance from their ends the center grips are reduced in size, as shown at 11 in order thereby to avoid the knife which is in each cutterhead. This reduction in size near the end is an important feature. The ends of these center grips are provided with suitable prongs, similar to those on wood-turning lathes, to penetrate the end of the wood block or pin to be turned. The funnel-shape of the cutterheads facilitates the placing in position of the wood block to be turned, which block is entered by the operator first in the cutter-head b on the hollow mandrel a, which latter at the time of entering the block will be turning backward, as hereinafter explained. These center grips are adapted to slide endwise in the hollow mandrels. Each center grip is provided at its outer end with a horizontal crossbar, 0 0 At one end of each of said crossbars a e in, p, is attached, passes over apulley, p on the side of the frame, and thence .loosely.

hangs down, and a separate weight, E, is attached to each chain. At the other end of each of said cross-bars is attached a chain, q, by an adjustable hook, g. In this case a single chain is employed for both. One end of this chain q therefore, is attached to the crossbar of the center grip O, and the other end to the cross-bar of the center grip Proceeding from each end, the chain passes over a pulley, q", on each frame, thence at the center the chain sags down from both pulleys, as shown in Figs. 2 and 3, and is attachedto a large weight, E. The two weights E at one side and the large weight E at the other serve to draw the center grips and keep them normally pressed toward each other, thereby adapting them to hold the wood block.

011 each frame is fixed a screw, F, which projects toward the end of the machine. This screw is provided with two nuts, 0', which may be set-apart at any point on the screw. A stop-finger, 1-, depends from each cross-bar, and has position close to the fixed screw and between the two nuts 1'. The stop-finger,therefore, can move only as far as the two nuts are spaced apart. This device, it will be seen, limits the endwise movement of the center grips, so they can move only so far as the nuts r are separated.

A right-angled lever, G, is pivoted at the end of the bed near the fixed frame. Its horizontal arm has a weight, H, suspended from it, and its upright arm carries a screw-bolt, I, provided with two nuts, 8. This screw-bolt may thus be adjusted. so that its end will be nearer to or farther away from the cross-bar This screw-bolt is held to its normal position by the weight H, and will move only when the crossbar 0 comes against it with a force sufficient to lift the said weight. The screw-bolt, therefore,will stop the back movement of the center grip 0 whenever the latter is moving with less force than will lift the weight.

A red, J, has one end rigidly attached to the cross-bar O, and extends, as seen in Fig. 2, to the cross-bar C of the center grip of the fixed frame through a hole, in which it passes This rod has a screw-thread, t, and is provided with a nut, The nut is between the two cross'bars. hen the two outter-heads have approached each other as close as it is practicable to have them, as seen in Fig. 1, the head part 1 of the particular form of insulator-pin shown will have been finished, but the shank part 2 will not be finished. This condition of the insulator-pin arises from the fact that the screw-bolt I is so adjusted as to stop the back movement of the shank cen ter gripObefore the cutter-headbhas finished the shank of the wood pin. The head part 1 of the pin at this stage stands off farther from the cutter-head 1) than it will when the shank 2 has been fully cut. Although the shank center grip has ceased to move, the hollow mandrel and cutter-head b on the reciprocating frame continues to advance until it finishes the head 1 of the pin. At this point in the operation the crank-wheel t" has made a halfrevolntion, by which the reciprocating frame has been drawn towards the fixed frame, and now a continuation of the turning of the crankwheel moves the reciprocating frame, its hollow mandrel, and the cutter-headb away from the finished pin-head 1.

The automatic belt-shifter consists of the angle-lever S, pivoted to the bed at d. The upright end, above the pulley c, has loops 01 through which the belts pass. The inclined or horizontal end rests on a roller, on the side of the reciprocating frame, and a weight, T, is suspended from the extremity of this end. When the reciprocating frame moves away from the fixed frame, the weight, by drawing down on the inclined end of the angle-lever, shifts the belts (Z and d, and brings the straight belt (1 onto the tight pulley 0, thereby turning the hollow mandrel a and its cutter-head b backward. At this time the block to be turned may be entered in said cutter-head. XVhen the reciprocating frame moves toward the fixed frame, the action of the roller 1 is to raise the inclined end of the angle-arm, there.- by shifting the crossed belt d from the loose pulley c to the tight pulley c and imparting a forward motion to the cutter-head I). The shank 2 of the pin is then finished by the aetion of the following instrumentalities: An upright support, K, at the end of the bed, near the reciprocating frame, has a lever-bolt, L, adjustable by the two nuts u. A lever, N, is pivotedto the bolt L, and its upper end takes loosely on a bolt, o, projecting from the crossbar (3. Two nuts, 12, on this bolt serve to adjust the position of the upper end of the lever. The lower end of the lever is jointed to a push-arm, P, which is bent up, as at 10, between its extremities. A plate, R, has one end fixed to the bed, and has a central slot, in which the lower jointed end of the lever swings. The end of the plate under the bent part 10 of the push-arm is slanting or beveled on the upper side, as at y, and this end sets above the bed, leaving a space, Z, below it. A horizontal plate, Z, is attached to the reciprocating frame just above the bed. This plate moves with the frame, and passes in the space Z under the plate R. The end Z of the plate is square.

The head part of the insulator-pin having been turned, and the shank part partly turned, as before stated, the shank is then finished as follows: The reciprocating frame and cutterhead move away from the pin. As the plate Z moves, its end Z comes in contact with the end of the push-arm P, which is thereby caused to move. This moves the lower end of the lever N, the upper end of which thereby presses the head center grip G endwise toward the fixed frame, by which movement the pin-shank 2 is forced into hollow mandrel a, whereupon the cutter-head b finishes the shank. At the same time that the center grip 0 moves, the rod J, by pressing on the cross-head 0 causes the shank center grip to move back, thereby lifting the weight H. The rod J thus exerts the pressure by which the weight is lifted, and thereby all liability of splitting the insulatorpin is avoided. When the reciprocating frame has moved away far enough to cause the head center grip O to press the pin-shank into the cutter-head b and finish it, the under side of the bend w or the push-arm will ride upon the bevel 3/ of the plate, and thereby the push-arm will be released from the square end Z of the plate.

Having described my invention, I claim and desire to secure by Letters Patent of the United States- 1. In a machine for turning pins, the combination of two hollow inandrels, a cutter-head on each mandrel, and center grips which occu py and move endwise within the hollow man drels, as set forth.

2. In a machine for turning pins, the combinati on of two hollow mandrels, a cutter-head on each mandrel, center grips which fit the bore of the hollow mandrel, move endwise, and at and for a short distance from their ends are reduced in size, as set forth.

3. I11 a machine for turning pins, the combination of two hollow mandrels, a cutter-head on each mandrel, center grips which occupy and move endwise within the hollow mandrels, chains and weights to draw the center grips toward each other, and adjustable stop devices to limit the movement of the grips, as set forth.

4. The combination of the center grips adapted to move endwise, a weighted lever to stop the back movement of one grip, and a rod, J, connected rigidly by one end to one grip, extending from thence to and passing loosely through a hole in a cross-bar on the other grip, and provided with a stop-nut, t, to press against the said cross-bar, as set forth.

5. The combination of a fixed frame, a reciprocating frame, a hollow mandrel carrying a cutter -head mounted on each frame, and a center grip in each hollow mandrel adapted to move endwise therein, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH J. BALDXVIN.

Vitnesses:

JNo. E. MORRIS, (Jr-ms. B. MANN. 

